Tonight I typed quite a long reply, but decided I needed to check it further before posting it. Can't find it anywhere! Don't want to have to re-type everything I said, so where can I find it, please? Nothing showing in my profile, tried the back button but it just will not come up!
Answering my own question, in case anyone else has similar problems: I had to go into the "Private Messages" bit, then a menu appeared on L-hand side of screen, including "Saved Drafts". Clicked on the thread name and it all disappeared again.
So............back to "Private Messages">Saved Drafts>Edit Drafts, and finally got my message back!